[Intel-gfx] Can't drive 4K monitor at full resolution over DP

[Bryan O'Sullivan]

Thanks, Jani, here's the bug report:
https://gitlab.freedesktop.org/drm/intel/-/issues/4531

On Sun, Nov 14, 2021 at 2:50 AM Saarinen, Jani <jani.saarinen at intel.com>
wrote:

> Hi Bryan.
> Can you file new bug:
> https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs
>
> Br,
>
> Jani Saarinen
> Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
>
>
>
> > -----Original Message-----
> > From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of
> Bryan
> > O'Sullivan
> > Sent: sunnuntai 14. marraskuuta 2021 6.36
> > To: intel-gfx at lists.freedesktop.org
> > Subject: [Intel-gfx] Can't drive 4K monitor at full resolution over DP
> >
> > I have a new Framework laptop running Fedora 35, stock kernel package
> 5.14.16-
> > 301, BDB version 240.
> >
> > My CPU/GPU is an 11th gen i7-1165G7, connected via a USB-C-to-DP cable
> to a
> > 2014-era Dell P2715Q monitor that supports 3840x2160 at 60Hz over DP (my
> Mac
> > drives it this way just fine).
> >
> > With i915 debugging enabled, I can see the 4K modeline being detected and
> > discarded because CLOCK_HIGH. Here's some debug output in a paste as
> it's longish
> > and verbose: https://pastebin.com/reGcmxYF
> >
> > Line 17 of that paste seems weird, where the value of everything is zero
> for some
> > reason?
> >
> > Here's some output from the monitor-edid tool. If there's any more
> information I
> > can supply to track this down, I'm happy to do what I can.
> >
> > Name: DELL P2715Q
> > EISA ID: DEL40bd
> > EDID version: 1.4
> > EDID extension blocks: 1
> > Screen size: 59.7 cm x 33.6 cm (26.97 inches, aspect ratio 16/9 = 1.78)
> > Gamma: 2.2
> > Digital signal
> > Max video bandwidth: 540 MHz
> >
> >         HorizSync 31-140
> >         VertRefresh 29-75
> >
> >         # Monitor preferred modeline (60.0 Hz vsync, 133.3 kHz hsync,
> ratio 16/9, 163
> > dpi)
> >         ModeLine "3840x2160" 533.25 3840 3888 3920 4000 2160 2163 2168
> 2222 -
> > hsync +vsync
> >
> >         # Monitor supported CEA modeline (60.0 Hz vsync, 67.5 kHz hsync,
> ratio 16/9,
> > 81 dpi)
> >         ModeLine "1920x1080" 148.5 1920 2008 2052 2200 1080 1084 1089
> 1125
> > +hsync +vsync
>
>
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