From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 73530] Asus U38N: Black screen with Radeon driver in Linux Date: Fri, 08 May 2015 07:36:31 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0915551900==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 8353E7A0F4 for ; Fri, 8 May 2015 00:36:31 -0700 (PDT) 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 --===============0915551900== Content-Type: multipart/alternative; boundary="1431070591.71be52.22982"; charset="UTF-8" --1431070591.71be52.22982 Date: Fri, 8 May 2015 07:36:31 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=73530 N.Leiten changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |nickleiten@gmail.com --- Comment #77 from N.Leiten --- Created attachment 115629 --> https://bugs.freedesktop.org/attachment.cgi?id=115629&action=edit Panel datasheet At this time I managed to get working video-stream to panel, but the timings is obviously wrong. The main problem is Spread Spectrum somehow get disabled in reinit cycle, and not enabled, so I just removed SS management and got blinking noise on the screen. Also I added some delays that necessary for this panel (maybe all another needs it too). Due to attached datasheet on page 15 we got sequence of power-on and power-off for this panel. Interesting this is Reset interval of 500ms which is mandatory between power-off panel and powering it back on. Now I'm trying to figure initial PLL setings that BIOS set before OS starts, after that I'll try to fix this behaviour. I don't fully know vesa framebuffer initialization, but as I understand, it get values from VBIOS/default BIOS address space for VGA and trying to apply them. Moreover, when radeon KMS is off I got fully different values of Modeline comparing to EDID. -- You are receiving this mail because: You are the assignee for the bug. --1431070591.71be52.22982 Date: Fri, 8 May 2015 07:36:31 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" changed bug 73530
What Removed Added
CC   nickleiten@gmail.com

Comment # 77 on bug 73530 from 
Created attachment 115629 [details]
Panel datasheet

At this time I managed to get working video-stream to panel, but the timings is
obviously wrong. The main problem is Spread Spectrum somehow get disabled in
reinit cycle, and not enabled, so I just removed SS management and got blinking
noise on the screen.
Also I added some delays that necessary for this panel (maybe all another needs
it too). Due to attached datasheet on page 15 we got sequence of power-on and
power-off for this panel. Interesting this is Reset interval of 500ms which is
mandatory between power-off panel and powering it back on.

Now I'm trying to figure initial PLL setings that BIOS set before OS starts,
after that I'll try to fix this behaviour. I don't fully know vesa framebuffer
initialization, but as I understand, it get values from VBIOS/default BIOS
address space for VGA and trying to apply them. Moreover, when radeon KMS is
off I got fully different values of Modeline comparing to EDID.

You are receiving this mail because:
  • You are the assignee for the bug.
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