This is a note to let you know that I've just added the patch titled drm/radeon: add a delay after ATPX dGPU power off to the 3.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-radeon-add-a-delay-after-atpx-dgpu-power-off.patch and it can be found in the queue-3.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From d814b24fb74cb9797d70cb8053961447c5879a5c Mon Sep 17 00:00:00 2001 From: Alex Deucher <alexander.deucher@xxxxxxx> Date: Wed, 1 Jun 2016 12:58:36 -0400 Subject: drm/radeon: add a delay after ATPX dGPU power off MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Alex Deucher <alexander.deucher@xxxxxxx> commit d814b24fb74cb9797d70cb8053961447c5879a5c upstream. ATPX dGPU power control requires a 200ms delay between power off and on. This should fix dGPU failures on resume from power off. Reviewed-by: Hawking Zhang <Hawking.Zhang@xxxxxxx> Acked-by: Christian König <christian.koenig@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/radeon/radeon_atpx_handler.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c +++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c @@ -10,6 +10,7 @@ #include <linux/slab.h> #include <linux/acpi.h> #include <linux/pci.h> +#include <linux/delay.h> #include "radeon_acpi.h" @@ -256,6 +257,10 @@ static int radeon_atpx_set_discrete_stat if (!info) return -EIO; kfree(info); + + /* 200ms delay is required after off */ + if (state == 0) + msleep(200); } return 0; } Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are queue-3.14/drm-radeon-add-a-delay-after-atpx-dgpu-power-off.patch queue-3.14/drm-radeon-support-backlight-control-for-uniphy3.patch queue-3.14/drm-radeon-poll-for-both-connect-disconnect-on-analog-connectors.patch queue-3.14/drm-radeon-fix-firmware-info-version-checks.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html