Re: Problem with external monitor
On 10/10/2014, Bret Busby <bret.busby@gmail.com> wrote:
> This will probably show as a new thread, due to me correcting a
> spelling error in the Subject field of the message.
>
> On 08/10/2014, Joe <joe@jretrading.com> wrote:
>> On Wed, 8 Oct 2014 15:23:55 +0800
>> Bret Busby <bret.busby@gmail.com> wrote:
>>
>>> Hello.
>>>
>>> I have a 23" monitor, that I want to use with two of my laptop
>>> computers (not at the same time).
>>>
>>> I have a 15" laptop, with an i3 CPU, running Debian 6 LTS and GNOME2.
>>>
>>> With the external monitor connected and switched on, upon bootup, the
>>> external monitor is automatically operational, and, replaces the
>>> laptop display.
>>>
>>> That is good.
>>>
>>> The other laptop has a 17" display and an i7CPU, and is running Debian
>>> 7.x and LXDE.
>>>
>>> With that laptop, with the external monitor connected and switched on,
>>> upon boot up and during a boot session, the external monitor does not
>>> work, and, is apparently not visible to the computer. The laptop
>>> display is operational, and no signal appears to be going from the
>>> laptop. Synaptic shows lxrandr to be installed, but the exernal
>>> monitor is not detected.
>>>
>>> In Preferences -> Monitors, only one monitor is shown; the laptop
>>> display.
>>>
>>> I also tried logging in to a GNOME Classic session, but got the same
>>> result.
>>>
>>> Both scenario's involve the use od a VGA cable and connection to the
>>> VGA socket on each of the respective laptops. That it is using the
>>> supplied VGA cable, and not aDVI or HDMI cable, is not a problem for
>>> me, as I find the resolution to be good enough for me.
>>>
>>> How do I get the external monitor to be detected, and, work, with the
>>> Debian7/LXDE system?
>>>
>>
>> Something I would suggest you try soon is a different model of external
>> monitor. If you spend weeks fiddling about with drivers and then find
>> the VGA socket on this laptop simply doesn't work, you will feel
>> foolish, trust me on this.
>>
>> Something else to try would be booting up a live CD of a more
>> commercial kind, such as Ubuntu or preferably Knoppix, to find out:
>> a) if it works
>> b) if so, what drivers it is using
>>
>> Is the external monitor going into standby, by the way? I have an old
>> laptop and know of someone else's monitor which simply doesn't work
>> with it. The laptop VGA circuits want to see an active monitor
>> connected before they will power up, and the monitor wants to see a
>> live signal before it will come out of standby, or avoid going into
>> standby from switch-on... I haven't found any combination of switch-on
>> time and plugging that will actually allow them to work together,
>> though I presume there is a window of a few microseconds when they
>> would find each other. The laptop is fine with other monitors, the
>> monitor with other laptops.
>>
>
> I have downloaded Ubuntu 14.04.1 LTS amd64 iso, and tried that.
>
> One interesting observation, is that, with the 15" laptop running
> Debian 6 LTS, on bootup, all video output goes to the external monitor
> (and to only that monitor), and, with the 17" laptop running Debian 7
> (and then Ubuntu 14.04.1 LTS), the ACER spalsh screen and the BIOS
> screen, go toonly the laptop monitor.
>
> That made me wonder whether either the BIOS or the graphics card,
> could not deal with the external monitor.
>
> However, with Unbuntu 14.04.1 LTS, which took 10-15 minutes (on an i7
> CPU with 32GM RAM) to boot, the output started to appear on the
> external monitor, after the weird double icon with the equal sign at
> the bottom of the screen, so I got the Ubuntu word, with the simulated
> LED flashing things (a fake progree bar) appearing on both screens.
>
> At the end of the bootup, I have on the external monitor, a workspace
> (?) with a panel/taskbar, and no icons on the desktop, and, on the
> laptop display, I have a workspace with the dialogue box or window,
> with the Welcome thing, with the options to select the languge, and to
> select "Try Ubuntu" or "Install Ubuntu".
>
> In selecting "Try Ubuntu", I get a desktop on each of the two screens;
> the one on the external monitor does not have the two icons "Examples"
> and "Install Ubuntu 14.04.1 LTS", whereas the display on the laptop
> does include those two icons.
>
> I can not find how to get the pointer off the laptop display and on to
> the external monitor.
>
> In selecting (on the laptop display), the System Settings -> Displays,
> I get both monitors displayed.
>
> When I select , for "Built In Display", "Off", the laptop display goes
> off, for a short period, and all control goes to the external monitor,
> and then the laptop display comes back on, with the pointer and the
> "Launcher" (?)icons, all on the external monitor.
>
> After shuuting down the live session of Ubuntu 14.04.1.LTS and then
> booting up Debian 7, to find whether the booting into Ubuntu, had
> flicked some switch that would enable displayiong on the external
> monitor, in Debian 7, Ifound the system to be unchanged from the
> previous advised problem - no external monitor detected.
>
> In Debian 7.x, selecting (in LXDE) Preferences-> Monitor Settings,
> which shows only the laptop display being detected, and the external
> monitor not being detected, LXRandR shows as version number 0.1.2 .
>
> Booting into Ubuntu again, in selecting System Settings -> System ->
> Details -> Overview, the Graphics is shown as Intel Haswell (Mobile).
>
> In System Settings -> Hardware -> Displays, both monitors are shown.
>
> When I run lshw in Ubuntu, in
> pci -> pci:0 -> display, it shows as "3D Controller", the GEForce GT750M,
> and, in
> pci -> display, it shows as "VGA compatible controller", "4th Gen Core
> Processor Integrated Graphics Controller" ; "vendor; Intel
> Corporation"
> -I assume that to be the Haswell thing.
>
> I do not know, in Ubuntu, how to get the software name and version
> number, that is the equivalent of the "LXRandR version number 0.1.2
> ".
>
> in the Debian lxterminal lshw output, for both pci:0 -> display, and
> display (without the pci:0 ->)the first line, hence, for both the
> nVidia and the Haswell controllers, the line states "UNCLAIMED". I do
> not know whether that is of any significance;
>
> "
> *-pci:0
> description: PCI bridge
> product: Haswell PCI Express x16 Controller
> vendor: Intel Corporation
> physical id: 1
> bus info: pci@0000:00:01.0
> version: 06
> width: 32 bits
> clock: 33MHz
> capabilities: pci normal_decode bus_master cap_list
> configuration: driver=pcieport
> resources: irq:40 ioport:4000(size=4096)
> memory:d2000000-d2ffffff ioport:a0000000(size=536870912)
> *-display UNCLAIMED
> description: 3D controller
> product: NVIDIA Corporation
> vendor: NVIDIA Corporation
> physical id: 0
> bus info: pci@0000:01:00.0
> version: a1
> width: 64 bits
> clock: 33MHz
> capabilities: cap_list
> configuration: latency=0
> resources: memory:d2000000-d2ffffff
> memory:a0000000-afffffff memory:b0000000-b1ffffff
> ioport:4000(size=128) memory:b2000000-b207ffff
> *-display UNCLAIMED
> description: VGA compatible controller
> product: Haswell Integrated Graphics Controller
> vendor: Intel Corporation
> physical id: 2
> bus info: pci@0000:00:02.0
> version: 06
> width: 64 bits
> clock: 33MHz
> capabilities: vga_controller bus_master cap_list
> configuration: latency=0
> resources: memory:d3000000-d33fffff
> memory:c0000000-cfffffff ioport:5000(size=64)
>
> "
>
> --
> Bret Busby
> Armadale
> West Australia
> ..............
>
> "So once you do know what the question actually is,
> you'll know what the answer means."
> - Deep Thought,
> Chapter 28 of Book 1 of
> "The Hitchhiker's Guide to the Galaxy:
> A Trilogy In Four Parts",
> written by Douglas Adams,
> published by Pan Books, 1992
>
> ....................................................
>
I am wondering whether a problem is that Debian 7 apparently does not
recognise the nVidia graphics card.
In the thread with the subject "Nvidia No GLX to using OpenGL" is reference to
https://wiki.debian.org/NvidiaGraphicsDrivers#Version_195.36.31
and, in going there, I found
"
Identification
The NVIDIA graphics processing unit (GPU) series/codename of an
installed video card can usually be identified using the lspci
command. For example:
$ lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G80
[GeForce 8800 GTS] [10de:0193] (rev a2)
See HowToIdentifyADevice/PCI for more information. The PCI ID can be
used to verify device support.
nvidia-detect
The nvidia-detect script (nvidia-detect package in non-free) can also
be used to identify the GPU and required driver:
$ nvidia-detect
Detected NVIDIA GPUs:
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF108
[GeForce GT 430] [10de:0de1] (rev a1)
Your card is supported by the default drivers.
It is recommended to install the
nvidia-glx
package.
"
The command line output below (from a root terminal session) shows
that the nvidia-detect package was not initially installed, so I
installed it, using synaptic, and then ran the command again.
"
root@bret-av3772g-deb:/home/bret# lspci -nn | grep VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell
Integrated Graphics Controller [8086:0416] (rev 06)
root@bret-av3772g-deb:/home/bret# nvidia-detect
bash: nvidia-detect: command not found
root@bret-av3772g-deb:/home/bret# nvidia-detect
No NVIDIA GPU detected.
root@bret-av3772g-deb:/home/bret#
"
My interpretation of that, is that Debian 7 does not detect the nVidia
graphics adaptor, which (to me) is weird, given that lshw shows the
nVidia graphics adaptor.
--
Bret Busby
Armadale
West Australia
..............
"So once you do know what the question actually is,
you'll know what the answer means."
- Deep Thought,
Chapter 28 of Book 1 of
"The Hitchhiker's Guide to the Galaxy:
A Trilogy In Four Parts",
written by Douglas Adams,
published by Pan Books, 1992
....................................................
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