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[solved] grub2 blank screen on thinkpad T23
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elsni
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PostPosted: Sun Sep 27, 2015 9:20 pm    Post subject: [solved] grub2 blank screen on thinkpad T23 Reply with quote

Hi,

after installing grub2 on a freshly installed system, grub shows "welcome to grub" for a short time, then blanks the screen and nothing happens.
The machine seems to hang, no disk activity. After a short time the fan goes to maximum speed. Reboot with ctrl-alt-del is possible.

What I tried:
Added GRUB_GFXPAYLOAD_LINUX=text to /etc/default/grub and did grub2-mkconfig again. No change.

Everything else I found regarding this issue confuses me :/

Does anyone have an idea?

Machine is an old IBM (not that lenovo crap ;) ) thinkpad t23 with S3 super savage graphics.
I'm stuck.

Thanks for any advice!


Last edited by elsni on Wed Sep 30, 2015 6:55 am; edited 1 time in total
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Logicien
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PostPosted: Sun Sep 27, 2015 11:11 pm    Post subject: Reply with quote

It's not clear if it's Grub or the Linux kernel who 'blank' the screen. You should set the GRUB_TIMEOUT=30 in /etc/default/grub and do grub-mkconfig. If the Grub menu appear and the selected entry lead to a blank screen, the Linux kernel is the problem.

With Savage video cards, you have two framebuffers who work, vesafb and uvesafb. simplefb may work too. If you configure only vesafb to be compiled in hard in the kernel image, it should work without any kernel parameter. The VESA norm is supported by most, if not all video chips.
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elsni
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PostPosted: Mon Sep 28, 2015 6:16 am    Post subject: Reply with quote

Logicien wrote:
It's not clear if it's Grub or the Linux kernel who 'blank' the screen. You should set the GRUB_TIMEOUT=30 in /etc/default/grub and do grub-mkconfig. If the Grub menu appear and the selected entry lead to a blank screen, the Linux kernel is the problem.


Blank screen appears less than 1 sec after displaying welcome message, I doubt the kernel loads that quickly.
I installed genkernel, so I expect it to work at least in text mode like as booting the installtion cd. I think I will switch to a customized kernel later.

Anyway, I will try what you suggested and report...

***update***

I added GRUB_TIMEOUT=30
No change, welcome massage flashes once, then blank screen...
Tapping or holding shift key during boot doesn't show the menu either.
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cwr
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PostPosted: Tue Sep 29, 2015 10:43 am    Post subject: Reply with quote

You may be out of luck - I haven't managed to run a kernel later than around 2012
on my T23, due to the lack of graphics memory (ISTR the Savage has around 16M).

Fortunately I have all the sources for the 2012 installation, and it keeps running; I
just don't update it. Since I don't use it on the Internet that's not really a problem.

Will

Edit: it looks as if the last kernel I managed to run was 2.6.38, with a Portage
snapshot of January 2012.
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elsni
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PostPosted: Wed Sep 30, 2015 6:54 am    Post subject: Reply with quote

cwr wrote:
You may be out of luck - I haven't managed to run a kernel later than around 2012
on my T23, due to the lack of graphics memory (ISTR the Savage has around 16M).


Maybe I run out of luck later, but for now I solved at least this issue by switching from grub2 to good old LILO.
;)
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cwr
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PostPosted: Wed Sep 30, 2015 3:23 pm    Post subject: Reply with quote

elsni wrote:

Maybe I run out of luck later, but for now I solved at least this issue by switching from grub2 to good old LILO.
;)


Worth knowing, thanks. I use Grub Classic, but I might have another shot at a more recent kernel

Will
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