Re: can't get a correct resolution[halt-solved]

[Andrei Borzenkov]

On Fri, Jul 3, 2015 at 4:10 PM, François Patte
<address@hidden> wrote:
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> Le 02/07/2015 05:16, Andrei Borzenkov a écrit :
>> В Wed, 01 Jul 2015 23:41:58 +0200 François Patte
>> <address@hidden> пишет:
>>
>>>>>>
>>>>>> If your kernel is using KMS drivers legacy VESA resolution
>>>>>> is effectively ignored. Try passing video=1280x1024 on
>>>>>> kernel command line.
>>>>
>>>>> Thank you for answering. I tried this but nothing
>>>>> changed....
>>>>
>>>>
>>>> Out of curiosity - what if you boot with nomodeset parameter
>>>> additionally? This should disable KMS completely.
>>
>>> No change....
>>
>>> I use nvidia driver, is this the source of the problem? If yes,
>>> how to solve it? When I boot the debian (which also use the
>>> nvidia driver) the resolution is correct...
>>
>>
>> Sorry, no idea. But I do not see how GRUB can do anything here.
>> After kernel is loaded it is up to kernel to set resolution. Did
>> you try asking on Fedora forums?
>
> I did, but no answer was given except to contact help-grub list....
>

:)

> I found a culprit: the command linux16 in the /boot/grub2/grub.cfg. If
> I change this command to linux, I can get the correct resolution
> during the boot.
>
> 3 questions arise:
>
> 1- The first line of the boot message begins by "failed" in red color,

Message from grub or message from kernel?

> but I cannot see what has failed because the display is too fast and I
> cannot stop it using the pause keys of the keyboard... How to slow
> down the messages? (my system is on SSD, so the boot takes less than
> 10s).
>
> 2- Changing linux16 to Linux seems to not affect the boot. Am I right?
>

I do not understand the question. Changing to linux obviously *does*
affect boot, you now get correct resolution :) Could you rephrase your
question?

> 3- How to get this change (linux16 to linux) resists to updates?
>

Sorry to disappoint you, but that is the question for your
distribution. Upstream grub does not emit "linux16" at all. This is
done by distro-specific patch.

But you should also be able to get desired resolution with linux16 by
adding vga= parameter to kernel command line. For 1024x768x16 this
would be vga=0x31A. See
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/fb/vesafb.txt
for list of possible modes.