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Code Issues Releases Activity

On some generations of the Intel GPU, disabling of the VGA Display

Browse Source 
stops updating the vertical retrace indicator.  The text mouse
renderer in syscons is executing from the callout and spins waiting
for the start of next frame.  As result, after the X server finishes,
since the VGA cannot be turned on, but syscons does not know about
this, the clock swi spins forever.

Hack around the problem by disabling wait for the retrace if KMS is
activated.

Diagnosed and tested by:	Michiel Boland <boland37@xs4all.nl>
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
This commit is contained in:
Konstantin Belousov 2013-06-18 20:19:09 +00:00
parent aec577b8d1
commit 1dc72d3681
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251961
2 changed files with 8 additions and 1 deletions
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3
sys/dev/drm2/i915/intel_fb.c
View File

@ -207,6 +207,8 @@ static void intel_fbdev_destroy(struct drm_device *dev,
}
}
extern int sc_txtmouse_no_retrace_wait;
int intel_fbdev_init(struct drm_device *dev)
{
struct intel_fbdev *ifbdev;
@ -229,6 +231,7 @@ int intel_fbdev_init(struct drm_device *dev)
drm_fb_helper_single_add_all_connectors(&ifbdev->helper);
drm_fb_helper_initial_config(&ifbdev->helper, 32);
sc_txtmouse_no_retrace_wait = 1;
return 0;
}

6
sys/dev/syscons/scvgarndr.c
View File

@ -395,6 +395,8 @@ vga_txtblink(scr_stat *scp, int at, int flip)
{
}
int sc_txtmouse_no_retrace_wait;
#ifndef SC_NO_CUTPASTE
static void
@ -445,7 +447,9 @@ draw_txtmouse(scr_stat *scp, int x, int y)
#if 1
/* wait for vertical retrace to avoid jitter on some videocards */
crtc_addr = scp->sc->adp->va_crtc_addr;
while (!(inb(crtc_addr + 6) & 0x08)) /* idle */ ;
while (!sc_txtmouse_no_retrace_wait &&
!(inb(crtc_addr + 6) & 0x08))
/* idle */ ;
#endif
c = scp->sc->mouse_char;
vidd_load_font(scp->sc->adp, 0, 32, 8, font_buf, c, 4);