<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Asus U38N: Black screen with Radeon driver in Linux" href="https://bugs.freedesktop.org/show_bug.cgi?id=73530#c65">Comment # 65</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Asus U38N: Black screen with Radeon driver in Linux" href="https://bugs.freedesktop.org/show_bug.cgi?id=73530">bug 73530</a> from <a class="email" href="mailto:agd5f@yahoo.com" title="Alex Deucher <agd5f@yahoo.com>"> Alex Deucher</a> <pre>(In reply to Christian Aßfalg from <a href="show_bug.cgi?id=73530#c63">comment #63</a>) > I think / guess that I am having the same issues. I've got the same laptop, > running Arch Linux. Mostly, I've been using the proprietary catalyst driver, > since I never got the free driver working. The proprietary is working fine. > > What is the issue here? You've been playing with timings for the physical > link to the internal panel? Is it so frickly? What would you need to fix the > issue? How can I help? In reply to Christian Aßfalg from <a href="show_bug.cgi?id=73530#c63">comment #63</a>) > I think / guess that I am having the same issues. I've got the same laptop, > running Arch Linux. Mostly, I've been using the proprietary catalyst driver, > since I never got the free driver working. The proprietary is working fine. > > What is the issue here? You've been playing with timings for the physical > link to the internal panel? Is it so frickly? What would you need to fix the > issue? How can I help? I suggested that it might be a timing issue, and as per <a href="show_bug.cgi?id=73530#c54">comment 54</a>. However, link training is successful so that monitor accepts the parameters that the driver proposed, it just sometimes chooses not to light up. I would suggest trying to tweak the link training timing as per <a href="show_bug.cgi?id=73530#c54">comment 54</a>, try disabling ss as per <a href="show_bug.cgi?id=73530#c6">comment 6</a>, and finally, try making some slight changes to the modeset sequence as per the attached patch. The patch adds a delay before enabling the video stream and additionally calls the enable video stream code again in case the monitor didn't quite get the signal the first time. E.g., diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c index a7f2ddf..256ed7d 100644 --- a/drivers/gpu/drm/radeon/atombios_encoders.c +++ b/drivers/gpu/drm/radeon/atombios_encoders.c @@ -1687,8 +1687,12 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode) if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(encoder)) && connector) { /* DP_SET_POWER_D0 is set in radeon_dp_link_train */ radeon_dp_link_train(encoder, connector); - if (ASIC_IS_DCE4(rdev)) + if (ASIC_IS_DCE4(rdev)) { + udelay(50); atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_VIDEO_ON, 0); + udelay(50); + atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_VIDEO_ON, 0); + } } if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) atombios_dig_transmitter_setup(encoder, Or move the backlight enable before the link training: diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c index a7f2ddf..3bfbfa4 100644 --- a/drivers/gpu/drm/radeon/atombios_encoders.c +++ b/drivers/gpu/drm/radeon/atombios_encoders.c @@ -1682,6 +1682,9 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode) radeon_dig_connector->edp_on = true; } } + if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) + atombios_dig_transmitter_setup(encoder, + ATOM_TRANSMITTER_ACTION_LCD_BLON, 0, 0); /* enable the transmitter */ atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE, 0, 0); if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(encoder)) && connector) { @@ -1690,9 +1693,6 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode) if (ASIC_IS_DCE4(rdev)) atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_VIDEO_ON, 0); } - if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) - atombios_dig_transmitter_setup(encoder, - ATOM_TRANSMITTER_ACTION_LCD_BLON, 0, 0); if (ext_encoder) atombios_external_encoder_setup(encoder, ext_encoder, ATOM_ENABLE); break; Or drop the backlight control altogether to see if that helps: diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c index a7f2ddf..9713078 100644 --- a/drivers/gpu/drm/radeon/atombios_encoders.c +++ b/drivers/gpu/drm/radeon/atombios_encoders.c @@ -1690,9 +1690,6 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode) if (ASIC_IS_DCE4(rdev)) atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_VIDEO_ON, 0); } - if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) - atombios_dig_transmitter_setup(encoder, - ATOM_TRANSMITTER_ACTION_LCD_BLON, 0, 0); if (ext_encoder) atombios_external_encoder_setup(encoder, ext_encoder, ATOM_ENABLE); break; @@ -1705,10 +1702,6 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode) } if (ext_encoder) atombios_external_encoder_setup(encoder, ext_encoder, ATOM_DISABLE); - if (radeon_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) - atombios_dig_transmitter_setup(encoder, - ATOM_TRANSMITTER_ACTION_LCD_BLOFF, 0, 0); - if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(encoder)) && connector && !travis_quirk) radeon_dp_set_rx_power_state(connector, DP_SET_POWER_D3);</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>