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 3.10, 3.11 and 3.12 Date: Fri, 17 Jan 2014 08:35:28 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1797569382==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 75D90106064 for ; Fri, 17 Jan 2014 00:35:28 -0800 (PST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1797569382== Content-Type: multipart/alternative; boundary="1389947728.dBeecc6D1.4274"; charset="us-ascii" --1389947728.dBeecc6D1.4274 Date: Fri, 17 Jan 2014 08:35:28 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=73530 --- Comment #40 from Paul Menzel --- Created attachment 92262 --> https://bugs.freedesktop.org/attachment.cgi?id=92262&action=edit Picture of a wrong timing(?) With commit 7424173698775ad90a039d8e00cbee333de536ec Author: Alex Deucher Date: Tue Jan 14 10:45:51 2014 -0500 drm/radeon/dp: sleep after powering up the display According to the DP 1.1 spec, the sink must power up within 1ms. Noticed while reviewing Thierry's drm/dp patches. Signed-off-by: Alex Deucher diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c index fb3ae07..ba7157a 100644 --- a/drivers/gpu/drm/radeon/atombios_dp.c +++ b/drivers/gpu/drm/radeon/atombios_dp.c @@ -671,9 +671,11 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info) u8 tmp; /* power up the sink */ - if (dp_info->dpcd[0] >= 0x11) + if (dp_info->dpcd[0] >= 0x11) { radeon_write_dpcd_reg(dp_info->radeon_connector, DP_SET_POWER, DP_SET_POWER_D0); + usleep_range(1000, 2000); + } /* possibly enable downspread on the sink */ if (dp_info->dpcd[3] & 0x1) I got the attached image after two xrandr off/on cycles. After the next off/on cycle the display worked. I did not notice such a behavior in my other tests. -- You are receiving this mail because: You are the assignee for the bug. --1389947728.dBeecc6D1.4274 Date: Fri, 17 Jan 2014 08:35:28 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 40 on bug 73530 from 
Created attachment 92262 [details]
Picture of a wrong timing(?)

With

commit 7424173698775ad90a039d8e00cbee333de536ec
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Tue Jan 14 10:45:51 2014 -0500

    drm/radeon/dp: sleep after powering up the display

    According to the DP 1.1 spec, the sink must power
    up within 1ms.  Noticed while reviewing Thierry's
    drm/dp patches.

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
b/drivers/gpu/drm/radeon/atombios_dp.c
index fb3ae07..ba7157a 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -671,9 +671,11 @@ static int radeon_dp_link_train_init(struct
radeon_dp_link_train_info *dp_info)
        u8 tmp;

        /* power up the sink */
-       if (dp_info->dpcd[0] >= 0x11)
+       if (dp_info->dpcd[0] >= 0x11) {
                radeon_write_dpcd_reg(dp_info->radeon_connector,
                                      DP_SET_POWER, DP_SET_POWER_D0);
+               usleep_range(1000, 2000);
+       }

        /* possibly enable downspread on the sink */
        if (dp_info->dpcd[3] & 0x1)

I got the attached image after two xrandr off/on cycles. After the next off/on
cycle the display worked. I did not notice such a behavior in my other tests.

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  • You are the assignee for the bug.
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