Re: Debian 7 and external monitors and graphics adaptors
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*
"
--
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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