linux-kernel - Re: udldrm does not recover from powersave? Re: udldrmfb: causes WARN in i915 on X60 (x86-32)

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Message-ID: <4fb31ea5-ef20-4752-4782-8d9f1afdf51d@suse.de>
Date:   Thu, 25 Feb 2021 11:02:02 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Pavel Machek <pavel@....cz>
Cc:     intel-gfx@...ts.freedesktop.org,
        kernel list <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org, rodrigo.vivi@...el.com,
        airlied@...hat.com, sean@...rly.run
Subject: Re: udldrm does not recover from powersave? Re: udldrmfb: causes WARN
 in i915 on X60 (x86-32)

Hi

Am 25.02.21 um 10:53 schrieb Pavel Machek:
> Hi!
> 
>>> This is in -next, but I get same behaviour on 5.11; and no, udl does
>>
>> Thanks for reporting. We are in the process of fixing the issue. The latest
>> patch is at [1].
>>
> 
> Thank you, that fixes the DMA issue, and I can use the udl.
> 
> ...for a while. Then screensaver blanks laptop screen, udl screen
> blanks too. Upon hitting a key, internal screen shows up, udl does
> not.
> 
> I try rerunning xrandr ... --auto, but could not recover it.
> 
> Any ideas?

Did it work before the regression?

For testing, could you please remove the fix and then do

   git revert 6eb0233ec2d0

This would restore the old version. Please report back on the results.

Best regards
Thomas

> 
> Best regards,
> 								Pavel
> 
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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