$ cat /etc/portage/package.mask/nvidia-drivers >=x11-drivers/nvidia-drivers-391.0.0 But my nightly update still produces >>> Running pre-merge checks for x11-drivers/nvidia-drivers-396.45 * Determining the location of the kernel source code * Found kernel source directory: * /usr/src/linux * Found kernel object directory: * /lib/modules/4.9.74-grsecurity/build * Found sources for kernel version: * 4.9.74-grsecurity * ***** WARNING ***** * * You are currently installing a version of nvidia-drivers that is * known not to work with a video card you have installed on your * system. If this is intentional, please ignore this. If it is not * please perform the following steps: * * Add the following mask entry to /etc/portage/package.mask by * echo ">=x11-drivers/nvidia-drivers-391.0.0" > /etc/portage/package.mask/nvidia-drivers $ emerge -p nvidia-drivers These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild U #] x11-drivers/nvidia-drivers-396.45 [390.77] $ emerge --info Portage 2.3.40 (python 3.6.5-final-0, default/linux/amd64/17.1/hardened, gcc-7.3.0, glibc-2.26-r7, 4.9.74-grsecurity x86_64) ================================================================= System uname: Linux-4.9.74-grsecurity-x86_64-Intel-R-_Core-TM-_i7-3770_CPU_@_3.40GHz-with-gentoo-2.4.1 KiB Mem: 18498880 total, 345760 free KiB Swap: 19335164 total, 19333476 free Timestamp of repository gentoo: Fri, 31 Aug 2018 07:00:01 +0000 Head commit of repository gentoo: 6f15fdf44a7bd3f10ec4268a5f7ab7d38c87b40e sh bash 4.4_p12 ld GNU ld (Gentoo 2.30 p2) 2.30.0 ccache version 3.3.4 [enabled] app-shells/bash: 4.4_p12::gentoo dev-java/java-config: 2.2.0-r4::gentoo dev-lang/perl: 5.24.3-r1::gentoo dev-lang/python: 2.7.14-r1::gentoo, 3.4.8::gentoo, 3.5.5::gentoo, 3.6.5::gentoo dev-util/ccache: 3.3.4-r1::gentoo dev-util/cmake: 3.9.6::gentoo dev-util/pkgconfig: 0.29.2::gentoo sys-apps/baselayout: 2.4.1-r2::gentoo sys-apps/openrc: 0.34.11::gentoo sys-apps/sandbox: 2.13::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69-r4::gentoo sys-devel/automake: 1.11.6-r3::gentoo, 1.13.4-r2::gentoo, 1.14.1-r2::gentoo, 1.15.1-r2::gentoo sys-devel/binutils: 2.30-r2::gentoo sys-devel/gcc: 7.3.0-r3::gentoo sys-devel/gcc-config: 1.8-r1::gentoo sys-devel/libtool: 2.4.6-r3::gentoo sys-devel/make: 4.2.1-r4::gentoo sys-kernel/linux-headers: 4.13::gentoo (virtual/os-headers) sys-libs/glibc: 2.26-r7::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://rsync.gentoo.org/gentoo-portage priority: -1000 sync-rsync-verify-jobs: 1 sync-rsync-verify-max-age: 24 sync-rsync-extra-opts: sync-rsync-verify-metamanifest: yes ago location: /var/lib/layman/ago sync-type: laymansync sync-uri: https://anongit.gentoo.org/git/dev/ago.git masters: gentoo priority: 50 ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -march=native -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -march=native -pipe" DISTDIR="/usr/portage/distfiles" ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs ccache config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync multilib-strict news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="en_US.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LINGUAS="en" MAKEOPTS="-j7" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git" PORTAGE_TMPDIR="/var/tmp" USE="X acl alsa amd64 avahi bzip2 crypt cscope cxx dbus gtk hardened iconv ipv6 jpeg libtirpc lock lvm multilib ncurses nls nptl nvidia openmp pam pcre pie pulseaudio qemu readline seccomp session ssl ssp startup-notification symlink thunar tls udev unicode virt-network xattr xinerama xtpax xulrunner zlib" ABI_X86="64 32" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon plan sheets stage words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-6 php7-0" POSTGRES_TARGETS="postgres9_5 postgres10" PYTHON_SINGLE_TARGET="python3_6" PYTHON_TARGETS="python2_7 python3_6" RUBY_TARGETS="ruby23" USERLAND="GNU" VIDEO_CARDS="nvidia" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
I think you'll find that you also have a /etc/portage/package.unmask entry which is undoing your local mask.
Please show the results of this command: grep -r nvidia-drivers /etc/portage
Right you are: $ sudo grep -lr nvidia-drivers /etc/portage /etc/portage/package.use/use /etc/portage/package.unmask/package.unmask /etc/portage/postsync.d/nvidia-drm-fix /etc/portage/package.accept_keywords/accept_keywords /etc/portage/package.mask/nvidia-drivers /etc/portage/package.mask/package.mask
