From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 86861] [rv6xx] When using a hardware KVM switch between computers EDID sometimes not detected/display goes fuzzy Date: Sun, 30 Nov 2014 13:03:30 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1760916408==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id EF51F6E064 for ; Sun, 30 Nov 2014 05:03:29 -0800 (PST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1760916408== Content-Type: multipart/alternative; boundary="1417352609.1aA377F30.10509"; charset="UTF-8" --1417352609.1aA377F30.10509 Date: Sun, 30 Nov 2014 13:03:29 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable https://bugs.freedesktop.org/show_bug.cgi?id=3D86861 --- Comment #1 from Christian K=C3=B6nig --- Sounds like just another buggy KVM switch to me. The basic problem is that the I=C2=B2C used to read the EDID assumes that y= ou only have two endpoints on the wire - the display and the gfx hardware. So prope= rly designed KVM switches have an micro-controller which fetches the EDID from = the monitor on connect and forwards the EDID to each connected system if reques= ted. Otherwise you run into problems when by pure coincident two systems try to fetch the EDID at the same time. Without the EDID the gfx hardware has no idea what resolutions the display = can handle and most likely doesn't choose the optimal one. Easiest workaround is manually set the necessary resolution for the display. --=20 You are receiving this mail because: You are the assignee for the bug. --1417352609.1aA377F30.10509 Date: Sun, 30 Nov 2014 13:03:29 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Comment= # 1 on bug 86861<= /a> from Christian K=C3=B6nig 
Sounds like just another buggy KVM switch to me.

The basic problem is that the I=C2=B2C used to read the EDID assumes that y=
ou only
have two endpoints on the wire - the display and the gfx hardware. So prope=
rly
designed KVM switches have an micro-controller which fetches the EDID from =
the
monitor on connect and forwards the EDID to each connected system if reques=
ted.
Otherwise you run into problems when by pure coincident two systems try to
fetch the EDID at the same time.

Without the EDID the gfx hardware has no idea what resolutions the display =
can
handle and most likely doesn't choose the optimal one. Easiest workaround is
manually set the necessary resolution for the display.

You are receiving this mail because: =20=20=20=20=20=20
  • You are the assignee for the bug.
--1417352609.1aA377F30.10509-- --===============1760916408== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJpLWRldmVs IG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHA6Ly9saXN0 cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWwK --===============1760916408==--