From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Nick Bowler <nbowler@elliptictech.com>
Cc: Alex Deucher <alexdeucher@gmail.com>,
Ben Skeggs <skeggsb@gmail.com>,
Martin Peres <martin.peres@labri.fr>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
dri-devel@lists.freedesktop.org
Subject: Re: Linux 3.4-rc4
Date: Sun, 29 Apr 2012 15:37:44 -0700 [thread overview]
Message-ID: <20120429223744.GA19382@core.coreip.homeip.net> (raw)
In-Reply-To: <20120428153350.GA19561@elliptictech.com>
On Sat, Apr 28, 2012 at 11:33:50AM -0400, Nick Bowler wrote:
> On 2012-04-28 02:19 -0400, Alex Deucher wrote:
> > On Fri, Apr 27, 2012 at 8:39 PM, Nick Bowler <nbowler@elliptictech.com> wrote:
> > > Hi Ben,
> > >
> > > On 2012-04-27 15:20 +1000, Ben Skeggs wrote:
> > >> Does this patch help you at all?
> > >>
> > >> http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=a3a285f17867f0018de798b5ee85731ec1268305
> > >
> > > Yes. I cherry-picked this patch on top of Linus' master (3.4-rc4+) and
> > > this appears to solve the "black screen on VGA" problem described in the
> > > original report. Thanks!
> > >
> > > Unfortunately, that's not the end of my VGA-related regressions. :(
> > >
> > > While tracking down the black screen issue, I've been having the monitor
> > > directly connected to the video card the whole time, but now when I'm
> > > connected through my KVM switch (an IOGear GCS1804), it appears that
> > > something's going wrong with reading the EDID, because the available
> > > modes are all screwed up (both console and X decide they want to drive
> > > the display at 1024x768). Here's the output of xrandr on 3.2.15:
> > >
> > > % xrandr
> > > Screen 1: minimum 320 x 200, current 1600 x 1200, maximum 4096 x 4096
> > > VGA-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 352mm x 264mm
> > > 1600x1200 75.0*+ 70.0 65.0 60.0
> > > 1280x1024 85.0 + 75.0 60.0
> > > 1920x1440 60.0
> > > 1856x1392 60.0
> > > 1792x1344 60.0
> > > 1920x1200 74.9 59.9
> > > 1680x1050 84.9 74.9 60.0
> > > 1400x1050 85.0 74.9 60.0
> > > 1440x900 84.8 75.0 59.9
> > > 1280x960 85.0 60.0
> > > 1360x768 60.0
> > > 1280x800 84.9 74.9 59.8
> > > 1152x864 75.0
> > > 1280x768 84.8 74.9 59.9
> > > 1024x768 85.0 75.1 75.0 70.1 60.0 43.5 43.5
> > > 832x624 74.6
> > > 800x600 85.1 72.2 75.0 60.3 56.2
> > > 848x480 60.0
> > > 640x480 85.0 75.0 72.8 72.8 66.7 60.0 59.9
> > > 720x400 85.0 87.8 70.1
> > > 640x400 85.1
> > > 640x350 85.1
> > > 320x200 165.1
> > >
> > > And on 3.4-rc4+ (with your patch cherry-picked):
> > >
> > > % xrandr
> > > Screen 1: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
> > > VGA-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
> > > 1024x768 60.0*
> > > 800x600 60.3 56.2
> > > 848x480 60.0
> > > 640x480 59.9
> > > 320x200 165.1
> > >
> > > Running xrandr on 3.4-rc4+ also causes the screen to go black for a
> > > second when it does not on 3.2.15. It also causes several messages of
> > > the form
> > >
> > > [drm] nouveau 0000:01:00.0: Load detected on output B
> > >
> > > to be logged. Also, looking at /sys/class/drm/card0-VGA-1/edid I see
> > > that it is empty on 3.4-rc4+ and it is correct on 3.2.15. Things seem
> > > to work OK when the KVM is not involved.
> >
> > Were you ever able to fetch a EDID with the KVM involved? KVMs are
> > notorious for not connecting the ddc pins.
>
> Yes, it works on 3.2.15 as described above.
I have the same (or similar) KVM (not in the office at the moment) and I
can confirm that with newer kernels EDID fecthing in flaky. It's 50/50
if EDED retrieval succeeds or if it fails with:
Apr 26 13:06:57 dtor-d630 kernel: [13464.936336] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Apr 26 13:06:57 dtor-d630 kernel: [13464.955317] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Apr 26 13:06:57 dtor-d630 kernel: [13464.973879] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Apr 27 09:13:03 dtor-d630 kernel: [44602.087659] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Apr 27 09:13:03 dtor-d630 kernel: [44602.107147] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Apr 27 09:13:03 dtor-d630 kernel: [44602.126908] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Apr 27 09:13:03 dtor-d630 kernel: [44602.146277] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Apr 27 09:13:03 dtor-d630 kernel: [44602.297659] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Apr 27 09:13:03 dtor-d630 kernel: [44602.317063] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 208
Earlier kernels were able to retrieve EDEDs reliably.
This is with:
[ 1.678392] [drm] nouveau 0000:01:00.0: Detected an NV50 generation card (0x086b00a2)
Thanks.
--
Dmitry
next prev parent reply other threads:[~2012-04-29 22:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-21 22:43 Linux 3.4-rc4 Linus Torvalds
2012-04-22 4:07 ` Nick Bowler
2012-04-22 4:51 ` Linus Torvalds
2012-04-22 7:26 ` Dave Airlie
2012-04-22 16:42 ` Nick Bowler
2012-04-23 3:16 ` Ben Skeggs
2012-04-22 16:40 ` Nick Bowler
2012-04-22 18:20 ` Geert Uytterhoeven
2012-04-23 0:05 ` Nick Bowler
2012-04-23 2:45 ` Konrad Rzeszutek Wilk
2012-04-24 1:03 ` Nick Bowler
2012-04-24 15:11 ` Konrad Rzeszutek Wilk
2012-04-25 1:35 ` Nick Bowler
2012-04-25 2:56 ` Ben Skeggs
2012-04-27 5:20 ` Ben Skeggs
2012-04-28 0:39 ` Nick Bowler
2012-04-28 6:19 ` Alex Deucher
2012-04-28 15:33 ` Nick Bowler
2012-04-29 22:37 ` Dmitry Torokhov [this message]
2012-04-30 9:07 ` Maarten Maathuis
2012-04-30 11:01 ` Luca Tettamanti
2012-05-02 7:54 ` Jean Delvare
2012-05-02 11:31 ` Ben Skeggs
2012-05-04 5:08 ` Ben Skeggs
2012-05-04 14:12 ` Jean Delvare
2012-05-01 13:23 ` Nick Bowler
2012-05-01 15:09 ` Alan Cox
2012-05-01 15:31 ` Nick Bowler
2012-05-01 15:45 ` Alan Cox
2012-05-02 1:20 ` Nick Bowler
2012-05-04 9:20 ` Dave Airlie
2012-05-05 15:39 ` Nick Bowler
2012-04-22 8:38 ` Bjarke Istrup Pedersen
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