On Fri, Jun 19, 2026 at 10:38:46PM +0200, Philippe wrote:
> > Synopsis: kernel panic on "wsconsctl display.screen_off=10000"
> > Category: kernel
> > Environment:
> System : OpenBSD 7.9
> Details : OpenBSD 7.9 (GENERIC.MP) #449: Wed May 6 13:17:25 MDT
> 2026
>
> [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
>
> Architecture: OpenBSD.amd64
> Machine : amd64
> > Description:
> I have a laptop without X and I tried to turn off the screen
> with the wsconsctl command. I found out that none of the
> wsconsctl commands regarding the screen work, and the
> display.screen_off actually creates a kernel panic.
> A picture of the kernel panic is attached to this email.
>
> I didn't previously work with OpenBSD on this machine before,
> so I don't know if it's a regression.
>
> > How-To-Repeat:
> wsconsctl display.screen_off=10000
>
> This leads to a kernel crash 10 seconds later.
thanks, fix committed to -current
Index: sys/dev/pci/drm/radeon/radeon_drv.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/drm/radeon/radeon_drv.c,v
diff -u -p -r1.22 radeon_drv.c
--- sys/dev/pci/drm/radeon/radeon_drv.c 9 Mar 2026 23:58:03 -0000 1.22
+++ sys/dev/pci/drm/radeon/radeon_drv.c 20 Jun 2026 13:18:12 -0000
@@ -733,6 +733,7 @@ radeondrm_detach_kms(struct device *self
}
void radeondrm_burner(void *, u_int, u_int);
+void radeondrm_burner_cb(void *);
int radeondrm_wsioctl(void *, u_long, caddr_t, int, struct proc *);
paddr_t radeondrm_wsmmap(void *, off_t, int);
int radeondrm_alloc_screen(void *, const struct wsscreen_descr *,
@@ -1265,6 +1266,7 @@ radeondrm_attachhook(struct device *self
const struct drm_format_info *format;
task_set(&rdev->switchtask, radeondrm_doswitch, ri);
+ task_set(&rdev->burner_task, radeondrm_burner_cb, rdev);
/* from linux radeon_pci_probe() */
@@ -1358,4 +1360,37 @@ radeondrm_activate_kms(struct device *se
}
return (rv);
+}
+
+void
+radeondrm_burner(void *v, u_int on, u_int flags)
+{
+ struct rasops_info *ri = v;
+ struct radeon_device *rdev = ri->ri_hw;
+
+ task_del(systq, &rdev->burner_task);
+
+ if (on)
+ rdev->burner_fblank = FB_BLANK_UNBLANK;
+ else {
+ if (flags & WSDISPLAY_BURN_VBLANK)
+ rdev->burner_fblank = FB_BLANK_VSYNC_SUSPEND;
+ else
+ rdev->burner_fblank = FB_BLANK_NORMAL;
+ }
+
+ /*
+ * Setting the DPMS mode may sleep while waiting for vblank so
+ * hand things off to a taskq.
+ */
+ task_add(systq, &rdev->burner_task);
+}
+
+void
+radeondrm_burner_cb(void *arg1)
+{
+ struct radeon_device *rdev = arg1;
+ struct drm_fb_helper *helper = rdev_to_drm(rdev)->fb_helper;
+
+ drm_fb_helper_blank(rdev->burner_fblank, helper->info);
}
Index: sys/dev/pci/drm/radeon/radeon_fbdev.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/drm/radeon/radeon_fbdev.c,v
diff -u -p -r1.5 radeon_fbdev.c
--- sys/dev/pci/drm/radeon/radeon_fbdev.c 9 Mar 2026 23:58:03 -0000
1.5
+++ sys/dev/pci/drm/radeon/radeon_fbdev.c 20 Jun 2026 13:04:58 -0000
@@ -338,36 +338,3 @@ bool radeon_fbdev_robj_is_fb(struct rade
return true;
}
-
-void
-radeondrm_burner(void *v, u_int on, u_int flags)
-{
- struct rasops_info *ri = v;
- struct radeon_device *rdev = ri->ri_hw;
-
- task_del(systq, &rdev->burner_task);
-
- if (on)
- rdev->burner_fblank = FB_BLANK_UNBLANK;
- else {
- if (flags & WSDISPLAY_BURN_VBLANK)
- rdev->burner_fblank = FB_BLANK_VSYNC_SUSPEND;
- else
- rdev->burner_fblank = FB_BLANK_NORMAL;
- }
-
- /*
- * Setting the DPMS mode may sleep while waiting for vblank so
- * hand things off to a taskq.
- */
- task_add(systq, &rdev->burner_task);
-}
-
-void
-radeondrm_burner_cb(void *arg1)
-{
- struct radeon_device *rdev = arg1;
- struct drm_fb_helper *helper = rdev_to_drm(rdev)->fb_helper;
-
- drm_fb_helper_blank(rdev->burner_fblank, helper->info);
-}
