Re: Debian 7 and external monitors and graphics adaptors
On 16/04/2015, Petter Adsen <petter@synth.no> wrote:
> On Thu, 16 Apr 2015 15:21:46 +0800
> Bret Busby <bret.busby@gmail.com> wrote:
>
>> On 16/04/2015, Petter Adsen <petter@synth.no> wrote:
>> > On Thu, 16 Apr 2015 14:46:46 +0800
>> > Bret Busby <bret.busby@gmail.com> wrote:
>> >
>> >> On 14/04/2015, Bret Busby <bret.busby@gmail.com> wrote:
>> >>
>> >>
>> >> <snip>
>> >>
>> >> >
>> >> > In the Debian 7 installation on the Acer V3-772G, for
>> >> > System -> Settings -> Details -> Overview, it has
>> >> >
>> >> > "
>> >> > Processor: Intel Core i&-4702MQ CPU @ 2.20GHz x 8
>> >> > Graphics: Gallium 0.4 on llvmpipe (LLVM 0x209)
>> >> > "
>> >> >
>> >> > and, for
>> >> >
>> >> > System -> Settings -> Details -> Graphics, it has
>> >> >
>> >> > "
>> >> > Driver: Gallium 0.4 on llvmpipe (LLVM 0x209)
>> >> > Experience: Fallback
>> >> > "
>> >> >
>> >>
>> >> I note that, having just installed (and presently updating) Ubuntu
>> >> 14.04LTS, on the Acer E5-521-238Q, the same graphics drive shows as
>> >> being used, as for Debian 7 on the Acer V3772G;
>> >>
>> >> from System Settings -> Hardware -> Overview, I have
>> >>
>> >> "
>> >> Processor: AMD E2-6110 APU with AMD Radeon R2 Graphics x4
>> >> Graphics: Gallium 0.4 on llvmpipe (LLVM 3.4, 128 bits)
>> >> "
>> >>
>> >> and the external monitor does not work with either Debian 7 or
>> >> Ubuntu 14.04LTS.
>> >>
>> >> So, whilst the Ubuntu web site shows the CPU to be certified as
>> >> compatible - at
>> >> http://www.ubuntu.com/certification/catalog/component/dmi/4365/dmi%3AAMDE2-6110APUwithAMDRadeonR2Graphics/
>> >>
>> >> it appears to me, that both Debian 7 and Ubuntu 14.04 LTS, do not
>> >> really have an adequate driver for that CPU ("Processor: AMD
>> >> E2-6110 APU with AMD Radeon R2 Graphics x4), as they both can not
>> >> drive an external monitor through it.
>> >
>> > I *seriously* doubt that the CPU has anything to do with it. It will
>> > either run x86 code (ie Debian/Ubuntu) or it won't. This is more
>> > likely a problem with the GPU driver, or the way X is set up.
>> >
>> > What output do you get from "xrandr" when you have booted the
>> > machine with the monitor connected?
>> >
>>
>> In Ubuntu 14.04 LTS;
>>
>> "
>> bret@bret-Aspire-E5-521:~$ xrandr
>> xrandr: Failed to get size of gamma for output default
>> Screen 0: minimum 1366 x 768, current 1366 x 768, maximum 1366 x 768
>> default connected primary 1366x768+0+0 0mm x 0mm
>> 1366x768 76.0*
>> "
>>
>> In Debian 7;
>>
>> "
>> bret@debian-Acer-E5-521:~$ xrandr
>> xrandr: Failed to get size of gamma for output default
>> Screen 0: minimum 1366 x 768, current 1368 x 768, maximum 1368 x 768
>> default connected 1368x768+0+0 0mm x 0mm
>> 1366x768 0.0
>> 1368x768 0.0*
>> "
>
> So X can only see one screen. I take it this is a laptop, and the
> screen X sees here is the internal screen? How is the other screen
> connected - HDMI, DVI, D-SUB, DP? I will see if I can get the time
> later today to read through all your previous messages on this and see
> what the outputs you have posted can tell me, right now the only thing
> I can think of is to try the AMD fglrx driver if you haven't already.
>
> If the GPU in your machine is a newer model, that might help. I would
> suggest you do a web search on the GPU model number, "radeon" and
> "second display" (all in one string), and see what you come up with -
> maybe the problem is a common one.
>
> Petter
>
> --
> "I'm ionized"
> "Are you sure?"
> "I'm positive."
>
the computer is an Acer E5-521-238Q laptop computer. The only screen
found by Linux (both Debian 7 and Ubuntu 14.04LTS) is the laptop
screen. The external monitor is a Dell ST2310, connected via HDMI.
--
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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