[Bug 76738] [snb regression] pll readout blows up on p1 == 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76738

--- Comment #9 from Peter Senna Tschudin <peter.senna at gmail.com> ---
On Wed, Sep 17, 2014 at 3:45 PM,  <bugzilla-daemon at freedesktop.org> wrote:
> Comment # 8 on bug 76738 from Imre Deak
>
> (In reply to comment #7)
>> >Can you try to remove any special options from grub like gfxmode or
>> > similar and
>> >let grub run in legacy vga mode?
>> Current configuration:
>> linux   /boot/vmlinuz-3.14.0-rc8+
>> root=UUID=135a331c-88e4-4131-8630-93fc16045d95 ro rd.md=0 rd.lvm=0 rd.dm=0
>> vconsole.keymap=us  rd.luks=0 vconsole.font=latarcyrheb-sun16 quiet
>>
>> What should I try?
>
> Just to clarify, does the HDMI output work at all with 3.14-rc7? There is at
> least an HDMI modeset in the log that seems to succeed.

I'm sorry but I have a different hardware setup now, with a newer
version of the GPU in which the problem doesn't happen any more.

>
> As Daniel pointed out, the BIOS or boot loader seems to configure the PLL
> with
> an invalid config, but then (at least 3.14-rc7 and for VGA) the driver
> modeset
> succeeds. Did you try already to upgrade your BIOS?
Toshiba has discontinued the model, but I was using the latest bios available.

>
> To make sure it's not a bootloader issue by forcing GRUB to use text mode:
> GRUB
> has additional global options besides those you listed above, you should
> check
> places like /etc/default/grub or /boot/grub/grub.cfg. You'd need to set
> something like GRUB_GFXPAYLOAD_LINUX=text for GRUB2.0, please check the GRUB
> docs to be sure. Afterwards we'd need another reg dump after you booted with
> nomodeset.
I don't have the hw any more, sorry.

>
> As I understood 3.12 worked with HDMI attached but 3.13 hanged. Could you do
> a
> kernel bisect between those two versions?
I don't have the hw any more, sorry.

>
> Thanks.
>
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