[Bug 69301] no screen on update from 3.12.0

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=69301

EmanueL Czirai <emanueLczirai@cryptoLab.net> changed:

           What    |Removed                     |Added
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                 CC|                            |emanueLczirai@cryptoLab.net

--- Comment #20 from EmanueL Czirai <emanueLczirai@cryptoLab.net> ---
"hangs on video initialisation"

This worked for me(disabling PAT) in a different but seemingly similar case:

"
CONFIG_X86_PAT:

Use PAT attributes to setup page level cache control.
PATs are the modern equivalents of MTRRs and are much more
flexible than MTRRs.

Say N here if you see bootup problems (boot crash, boot hang,
spontaneous reboots) or a non-working video driver.

If unsure, say Y.
"


I wrote this for another user:

"
 You could try with kernel option CONFIG_X86_PAT turned off. (I'm assuming
here, that you had it turned on; it's a child option to MTRR which is in
'Processor features' main menu in eg. 'make nconfig')
 I get random black screens right when luks password is about to be entered(and
system seems locked up) because that's when radeon switches from text mode into
frame buffer(graphics) mode, and that's when it happens(for me anyway). But
sometimes I just keep getting this black screen on startup, in which case, I
just pass radeon.modeset=0 to kernel cmdline(through grub) and this way I get
past it(because it doesn't change into graphics mode) so that I can recompile
kernel with that PAT option off; during this time you don't have KMS so X (eg.
startx) won't work.
"

Cheers,
EmanueL.

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