Fwd: unable to boot when monitor is attached

Fwd: unable to boot when monitor is attached

[Bagas Sanjaya]

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> 
> In the latest 6.3 and 6.4, it is impossible for me to boot my laptop if my DELL U2720Q monitor is plugged in (USB-C). I have to unplug it, then boot. As soon as the first second of boot went through, I can plug in my monitor and there is no issue afterward. There is no issue waking up after suspend. Only when it boots.
> 
> See the attached pictures of the trace. The trace itself seems random (at least to me :)). I tried several things, like removing any attached USB devices from the monitor built-in USB-hub, but that does not change anything. (there is a keyboard and trackpad attached).

See Bugzilla for the full thread.

Unfortunately, the reporter can only provide photos of kernel trace
(as he doesn't have any other means to extract kernel logs, maybe
connecting over serial helps; see Bugzilla for these attachments).

Anyway, I'm adding it to regzbot so that it doesn't fall through
cracks unnoticed:

#regzbot introduced: v6.1..v6.3 https://bugzilla.kernel.org/show_bug.cgi?id=217637
#regzbot title: unable to boot with Dell U2720Q monitor attached

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217637

-- 
An old man doll... just what I always wanted! - Clara

Re: Fwd: unable to boot when monitor is attached

[Dr. David Alan Gilbert]

* Bagas Sanjaya (bagasdotme@gmail.com) wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
> 
> > 
> > In the latest 6.3 and 6.4, it is impossible for me to boot my laptop if my DELL U2720Q monitor is plugged in (USB-C). I have to unplug it, then boot. As soon as the first second of boot went through, I can plug in my monitor and there is no issue afterward. There is no issue waking up after suspend. Only when it boots.
> > 
> > See the attached pictures of the trace. The trace itself seems random (at least to me :)). I tried several things, like removing any attached USB devices from the monitor built-in USB-hub, but that does not change anything. (there is a keyboard and trackpad attached).
> 
> See Bugzilla for the full thread.
> 
> Unfortunately, the reporter can only provide photos of kernel trace
> (as he doesn't have any other means to extract kernel logs, maybe
> connecting over serial helps; see Bugzilla for these attachments).

I note the photos have 'crud' at the bottom; as if something interesting
is in the video ram; perhaps something is freaked out by this nice 4k
monitor and some useful data structures are ending up in video ram.

(Also note it's a librem with pureboot)

Dave

> 
> Anyway, I'm adding it to regzbot so that it doesn't fall through
> cracks unnoticed:
> 
> #regzbot introduced: v6.1..v6.3 https://bugzilla.kernel.org/show_bug.cgi?id=217637
> #regzbot title: unable to boot with Dell U2720Q monitor attached
> 
> Thanks.
> 
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217637
> 
> -- 
> An old man doll... just what I always wanted! - Clara
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
\        dave @ treblig.org |                               | In Hex /
 \ _________________________|_____ http://www.treblig.org   |_______/

Re: Fwd: unable to boot when monitor is attached

[Randy Dunlap]

On 7/6/23 17:45, Dr. David Alan Gilbert wrote:
> * Bagas Sanjaya (bagasdotme@gmail.com) wrote:
>> Hi,
>>
>> I notice a regression report on Bugzilla [1]. Quoting from it:
>>
>>>
>>> In the latest 6.3 and 6.4, it is impossible for me to boot my laptop if my DELL U2720Q monitor is plugged in (USB-C). I have to unplug it, then boot. As soon as the first second of boot went through, I can plug in my monitor and there is no issue afterward. There is no issue waking up after suspend. Only when it boots.
>>>
>>> See the attached pictures of the trace. The trace itself seems random (at least to me :)). I tried several things, like removing any attached USB devices from the monitor built-in USB-hub, but that does not change anything. (there is a keyboard and trackpad attached).
>>
>> See Bugzilla for the full thread.
>>
>> Unfortunately, the reporter can only provide photos of kernel trace
>> (as he doesn't have any other means to extract kernel logs, maybe
>> connecting over serial helps; see Bugzilla for these attachments).
> 
> I note the photos have 'crud' at the bottom; as if something interesting
> is in the video ram; perhaps something is freaked out by this nice 4k
> monitor and some useful data structures are ending up in video ram.
> 
> (Also note it's a librem with pureboot)
> 
> Dave
> 
>>
>> Anyway, I'm adding it to regzbot so that it doesn't fall through
>> cracks unnoticed:
>>
>> #regzbot introduced: v6.1..v6.3 https://bugzilla.kernel.org/show_bug.cgi?id=217637
>> #regzbot title: unable to boot with Dell U2720Q monitor attached
>>
>> Thanks.
>>
>> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217637

So what are __pfx_worker_thread and __pfx_kthread?
Where are they from?

-- 
~Randy

Re: Fwd: unable to boot when monitor is attached

[Bagas Sanjaya]

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On Fri, Jul 07, 2023 at 07:10:13AM +0700, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
> 
> > 
> > In the latest 6.3 and 6.4, it is impossible for me to boot my laptop if my DELL U2720Q monitor is plugged in (USB-C). I have to unplug it, then boot. As soon as the first second of boot went through, I can plug in my monitor and there is no issue afterward. There is no issue waking up after suspend. Only when it boots.
> > 
> > See the attached pictures of the trace. The trace itself seems random (at least to me :)). I tried several things, like removing any attached USB devices from the monitor built-in USB-hub, but that does not change anything. (there is a keyboard and trackpad attached).
> 
> See Bugzilla for the full thread.
> 
> Unfortunately, the reporter can only provide photos of kernel trace
> (as he doesn't have any other means to extract kernel logs, maybe
> connecting over serial helps; see Bugzilla for these attachments).
> 
> Anyway, I'm adding it to regzbot so that it doesn't fall through
> cracks unnoticed:
> 
> #regzbot introduced: v6.1..v6.3 https://bugzilla.kernel.org/show_bug.cgi?id=217637
> #regzbot title: unable to boot with Dell U2720Q monitor attached
> 

A PureBoot developer noted that this regression is firmware bug
(see Bugzilla), thus:

#regzbot inconclusive: firmware bug, fixing the kernel only workarounds buggy firmware

Thanks.


-- 
An old man doll... just what I always wanted! - Clara

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